+ mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch added to mm-unstable branch

+ mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: also update the doc for __GFP_NOFAIL with order > 1
has been added to the -mm mm-unstable branch.  Its filename is
     mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Barry Song <v-songbaohua@oppo.com>
Subject: mm: also update the doc for __GFP_NOFAIL with order > 1
Date: Wed, 4 Sep 2024 10:26:19 +1200

Obviously we only support order <= 1 __GFP_NOFAIL allocation and if
someone wants larger memory, they should consider using kvmalloc()
instead.

Link: https://lkml.kernel.org/r/20240903223935.1697-1-21cnbao@gmail.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/gfp_types.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/linux/gfp_types.h~mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix
+++ a/include/linux/gfp_types.h
@@ -253,7 +253,8 @@ enum {
  * used only when there is no reasonable failure policy) but it is
  * definitely preferable to use the flag rather than opencode endless
  * loop around allocator.
- * Using this flag for costly allocations is _highly_ discouraged.
+ * Allocating pages from the buddy with __GFP_NOFAIL and order > 1 is
+ * not supported. Please consider using kvmalloc() instead.
  */
 #define __GFP_IO	((__force gfp_t)___GFP_IO)
 #define __GFP_FS	((__force gfp_t)___GFP_FS)
_

Patches currently in -mm which might be from v-songbaohua@oppo.com are

mm-rename-instances-of-swap_info_struct-to-meaningful-si.patch
mm-attempt-to-batch-free-swap-entries-for-zap_pte_range.patch
mm-attempt-to-batch-free-swap-entries-for-zap_pte_range-fix.patch
mm-count-the-number-of-anonymous-thps-per-size.patch
mm-count-the-number-of-partially-mapped-anonymous-thps-per-size.patch
mm-document-__gfp_nofail-must-be-blockable.patch
mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner.patch
mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch